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Metadata: Riverine plume extent and frequency between 2017-2023 in Sri Lanka's Exclusive Economic Zone and southern tip of India
Abstract:
Riverine plume extent and the frequency of plume occurrence between 2017-2023 derived from ocean colour Sentinel-3 Ocean and Land Colour Instrument (OLCI) data in Sri Lanka's Exclusive Economic Zone (EEZ) and southern tip of India. This data was created under Ocean Country Partnership Programme (OCPP) funded Defra (funding: project number GB-GOV-7-BPFOCPP)
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 8972 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | Riverine plume extent and frequency between 2017-2023 in Sri Lanka's Exclusive Economic Zone and southern tip of India |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | CEFAS03567764-da98-433d-b8cf-29a07f2156a2 |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS22242 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2026-04-19 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2026-04-19 |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | Riverine plume extent and the frequency of plume occurrence between 2017-2023 derived from ocean colour Sentinel-3 Ocean and Land Colour Instrument (OLCI) data in Sri Lanka's Exclusive Economic Zone (EEZ) and southern tip of India. This data was created under Ocean Country Partnership Programme (OCPP) funded Defra (funding: project number GB-GOV-7-BPFOCPP) |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Methodology of deriving plume extent and frequency. Sentinel-3 OLCI L1 data was atmospherically corrected using Polymer atmospheric correction to derive water leaving reflectance (Rw). Rw was used to calculate Forel-Ule Index (FUI) in Python based on the GitHub repository here: `https://github.com/CefasRepRes/FUME`_ FUI is a 21 colour scale ranging from indigo blue to cola brown, qualitatively describing bio-geo-chemical properties of the water ( `http://www.citclops.eu/water-colour/measuring-water-colour`_). Daily FUI values were resampled to a regular grid and aggregated to monthly composites using mean FUI per pixel. Statistics (mean, minimum, maximum per pixel) between 2017-2023 were calculated using the mean monthly FUI composites. Maximum mean FUI between 2017-2023, where FUI>=10, was used as a threshold to map the presence of the plume extent based on Fronkova et al, 2022 `https://doi.org/10.3390/rs14102375`_. The contour of the plume extent was simplified using 5km distance using ArcGIS Pro. Frequency of FUI>= 10 was calculated in Python and normalised between 0 and 1, where 1 means the plume occurred all of the times between 2017-2023 in the particular pixel, and 0 means no data. The plume frequency was calculated based on four seasons in Sri Lanka: 1. First inter-monsoon (March-April): SLKplumefreqmeanfirstintermoons2017_2023.tif 2. Southwest monsoon (May-September): SLKplumefreqmeanswmonsoon2017_2023.tif 3. Second inter-monsoon (October-November): SLKplumefreqmeansecondintermonsoon2017_2023.tif 4. Northeast monsoon (December-February): SLKplumefreqmeannemonsoon2017_2023.tif Spatial resolution of the frequency data is 300m and EPSG 4326 (geotiffs) Input data sources for the analysis: Copernicus Sentinel data [2017 - 2023] , EUMETSAT products 0409 and 0577 `https://data.eumetsat.int/product/EO:EUM:DAT:0409`_ and `https://data.eumetsat.int/product/EO:EUM:DAT:0577`_ .. _`https://github.com/cefasrepres/fume`: https://github.com/CefasRepRes/FUME .. _`http://www.citclops.eu/water-colour/measuring-water-colour`: http://www.citclops.eu/water-colour/measuring-water-colour .. _`https://doi.org/10.3390/rs14102375`: https://www.mdpi.com/2072-4292/14/10/2375 .. _`https://data.eumetsat.int/product/eo:eum:dat:0409`: https://data.eumetsat.int/product/EO:EUM:DAT:0409 .. _`https://data.eumetsat.int/product/eo:eum:dat:0577`: https://data.eumetsat.int/product/EO:EUM:DAT:0577 |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Ecology |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Estuary | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Exposure | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Monitoring | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | River flow and discharge | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Habitats and biotopes | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Area management/restriction/regulation zones and reporting units | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Unknown | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | data.gov.uk | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 20 |
| East | The eastern-most limit of the data resource in decimal degrees | 90 |
| West | The western-most limit of the data resource in decimal degrees | 70 |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| data.manager@cefas.co.uk | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://data.cefas.co.uk/view/22242 |
| Locator name | Name of the web resource | Cefas Data Portal |
| Dataset constraints | ||
| 20.1 Limitations on Public Access - Access constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 20.2 Limitations on Public Access - Other constraints | noLimitations | |
| 21.1 Conditions for Access and Use - Use constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 21.2 Conditions for Access and Use - Other constraints | https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ | |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2025-06-17 |
| Date of last revision | The most recent date that the resource was revised. | 2025-08-28 |
| Date of creation | The date that the resource was created. | 2025-06-09 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2025-08-28 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 3.1.1 |